This is the shocking moment a motorist was caught driving at almost double the speed limit - without noticing the cops were directly behind.

In the footage, caught on the officer's own dashcam and posted on social media, the VW Golf is first seen speeding along the motorway in the outside lane at 103mph.

As the short clip continues, the driver builds up speed and is recorded speeding at 136mph - nearly double the set limit for a motorway.

The footage was posted to Twitter on the Police traffic account along with the comment: “Now when you’re hogging the outside lane and exceeding the speed limit and the cops draw up behind you in a liveried 330 its usually time to move.